Out in the no-mans land of the international waters are the only means of communication with the submarines to use radio in the vlf or elf range.
在茫茫大洋深处，唯一可用的通信手段就是甚低频或者极低频无线电。
The signal will have attenuation and disturbance due to environmental factors in the process of VLF radio wave propagation, which will impact the reliability of submarine communication.
甚低频(VLF)电波传播过程中因环境因素影响会使信号产生衰减与扰动，导致潜艇收信可靠性下降。
Abstract: the VLF Through-the-Earth Communication system is recognized as the most reliable way of conveying dispatching information due to its special transmission media.
文摘：由于大地信道稳定，低频透地通信被认为是最可靠的救急通信方式。
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